CN105277445A - Compact tensile sample creep-fatigue crack propagation testing device - Google Patents
Compact tensile sample creep-fatigue crack propagation testing device Download PDFInfo
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- CN105277445A CN105277445A CN201510801652.XA CN201510801652A CN105277445A CN 105277445 A CN105277445 A CN 105277445A CN 201510801652 A CN201510801652 A CN 201510801652A CN 105277445 A CN105277445 A CN 105277445A
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Abstract
The invention discloses a compact tensile sample creep-fatigue crack propagation testing device. The compact tensile sample creep-fatigue crack propagation testing device comprises a main shaft assembly, an upper chuck assembly and a lower chuck assembly are arranged at one end of the main shaft assembly, and a load linear displacement measurement assembly is arranged at the other end of the main shaft assembly. The upper chuck assembly is in threaded connection with a high-temperature pull rod of a fatigue-creep tester, the main shaft assembly comprises an upper connecting rod and a lower connecting rod, and the upper connecting rod and the lower connecting rod are coaxial. An axial guide rail is arranged at the lower end of the lower pull rod, and the lower chuck assembly is in threaded connection with the upper connecting rod. The load linear displacement measurement assembly comprises two fixing assemblies of the same structure and two measurement assemblies of the same structure, wherein the two fixing assemblies of the same structure and the two measurement assemblies of the same structure are symmetrically arranged on the two sides of the main shaft assembly respectively. Through the device, a compact tensile sample can be fixed, load linear displacement data in creep-fatigue crack propagation can be measured, and the clamp is compact and simple in structure and convenient and flexible to use and is matched with an existing tester well.
Description
Technical field
The present invention relates to a kind of high-temperature behavior detection field of material, more particularly, relate to crack expansion test device under a kind of compact tensile specimen creep-fatigue interaction.
Background technology
At present along with the high speed development of China's economic, more and more higher to the demand of the energy, cause the pollution of environment also to increase the weight of, the discharge therefore improving the utilization ratio of the energy, the Development of Novel energy, minimizing harmful gas and greenhouse gases becomes the important support point of sustainable economic development thereupon.While development new forms of energy, when improving the operating parameter of commercial plant, improve the most effective means of the service efficiency of the existing energy and nutrient transformation efficiency.Therefore in the high energy consumption industries such as thermoelectricity, nuclear power, petrochemical industry and oil refining all towards high temperature, high pressure, framework maximize trend development.How to ensure that the safety and stability of relevant device in high temperature and rugged surroundings becomes great research topic.In-service equipment is on active service to material generation creep impairment for a long time at high temperature, and the load simultaneously changed can produce fatigue damage to material, makes parts finally cause creep-fatigue interaction to destroy.And the general more complicated of high-temperature component structure, unavoidable existing defects, causes germinating and the expansion of crackle under long service condition.Therefore, be ensure the integrality of thermal structure, obtain the high-temperature behavior of material under its in-service condition, the residual life of the in-service thermal structure of accurate evaluation, the Crack Extension under researching high-temperature creep-fatigue interaction is significant.The current domestic test unit about creep-fatigue is relatively less, especially the parameter such as Measurement accuracy loaded line displacement.Therefore, the mutual test unit of creep-fatigue designing a set of applicable compact tensile specimen has just become the emphasis of research.
Summary of the invention
The object of the invention is to provide a kind of compact tensile specimen creep-fatigue crack expansion test device, compact tensile specimen can be fixed by this apparatus system, and loaded line Displacement transfer under high temperature is measured under normal temperature, avoid the deficiency directly measuring distortion in high temperature environments, compact simple and easy, the easy to use and flexible of this clamp structure, and with existing testing machine no-float.
The invention provides a kind of compact tensile specimen creep-fatigue crack expansion test device, comprise spindle assemblies, one end of described spindle assemblies is provided with upper grip assembly and lower chuck assembly, and the other end of described spindle assemblies is provided with loaded line displacement measurement assembly; Described upper grip assembly is identical with the structure of lower chuck assembly comprises chuck and pin respectively, described chuck is character cut in bas-relief opening fork, the web joint of character cut in bas-relief opening fork is provided with threaded hole, coaxial pin-and-hole is provided with in the both sides of character cut in bas-relief opening fork, described pin is through in the pin-and-hole of character cut in bas-relief opening fork both sides, the two ends of described pin expose to the both sides of character cut in bas-relief opening fork respectively, and the two ends of described pin are respectively equipped with draw-in groove; Be thread connection between described upper grip assembly and the high temperature pull bar of high-temerature creep-fatigue tester; Described spindle assemblies comprises connecting rod and lower link, described upper connecting rod and described lower link coaxial; The lower end of described lower link is provided with axial guidance; Be thread connection between described lower chuck assembly and described upper connecting rod; Described loaded line displacement measurement assembly comprises the identical fixation kit of the two groups of structures measurement components identical with two groups of structures; Described fixation kit comprise snap ring, lower snap ring, two voussoirs, on extend bar and under to extend bar, described upper snap ring is identical with the structure of lower snap ring: the angle block of right angle be namely made up of two side plates, and described two side plates are respectively equipped with through hole; Described upper snap ring by the through hole on a side plate with on bar of extending rivet, described upper snap ring is joined merga pass voussoir by the pin in the through hole on another side plate and upper grip assembly and is fixed, thus by extend one end of bar and described upper grip assembly fix; Described lower snap ring by the through hole on a side plate with under bar of extending rivet, described lower snap ring is joined merga pass voussoir by the pin in the through hole on another side plate and lower chuck assembly and is fixed, thus by under extend one end of bar and described lower chuck assembly fix; Described measurement components comprise with described on extend bar the other end bracket of fixing and with described under to extend the fixing bottom bracket of the other end of bar, be provided with two deep groove ball bearings between described bracket and described axial guidance and between described bottom bracket and described axial guidance respectively; Described bracket is provided with the first axially extending bore, is provided with adjuster bar in described first axially extending bore, and described adjuster bar holds out against screw by one and fixes; Described bottom bracket is provided with second axially extending bore coaxial with the first axially extending bore in bracket, and described second axially extending bore is for placing extensometer, and described extensometer holds out against screw by one and fixes; Be provided with a spring(-supported) mount respectively in two bracket in two groups of measurement components and on two bottom brackets, between two spring(-supported) mounts between two spring(-supported) mounts between two bracket and between two bottom brackets, be equipped with two tension springs; The measurement components that the identical fixation kit of two groups of structures is identical with two groups of structures is arranged on the both sides of spindle assemblies respectively symmetrically.
Further, Novel compact tensile sample creep-fatigue crack expansion test device of the present invention wherein, is coaxially arranged between described upper grip assembly, described lower chuck assembly, described loaded line displacement measurement assembly.
Compared with prior art, the invention has the beneficial effects as follows:
Compact tensile specimen creep-fatigue crack expansion test device of the present invention, coordinate with existing high-temerature creep testing machine, can realize, to the test of compact tensile specimen creep-fatigue Crack Extension performance, expanding the scope of application of traditional experiment machine under the prerequisite without the need to transforming existing equipment.
Accompanying drawing explanation
Fig. 1 is the stereographic map of Novel compact tensile sample creep-fatigue crack expansion test device of the present invention;
Fig. 2 is the chuck component stereographic map of test unit shown in Fig. 1;
Fig. 3 is the stereographic map of the spindle assemblies of test unit shown in Fig. 1;
Fig. 4-1 is the stereographic map of the fixation kit of the loaded line displacement measurement assembly of test unit shown in Fig. 1;
Fig. 4-2 is stereographic maps of the measurement components of the loaded line displacement measurement assembly of test unit shown in Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is described in further detail.
As shown in Figure 1, a kind of compact tensile specimen creep-fatigue of the present invention crack expansion test device, comprise spindle assemblies 50, one end of described spindle assemblies 50 is provided with upper grip assembly 10 and lower chuck assembly 20, and the other end of described spindle assemblies 50 is provided with loaded line displacement measurement assembly 30.
Described upper grip assembly is identical with the structure of lower chuck assembly comprises chuck 11 and pin 12 respectively, described chuck 11 is character cut in bas-relief opening fork, the web joint of character cut in bas-relief opening fork is provided with threaded hole, coaxial pin-and-hole is provided with in the both sides of character cut in bas-relief opening fork, described pin 12 is through in the pin-and-hole of character cut in bas-relief opening fork both sides, the two ends of described pin 12 expose to the both sides of character cut in bas-relief opening fork respectively, and the two ends of described pin 12 are respectively equipped with draw-in groove 13; Be thread connection between described upper grip assembly and the high temperature pull bar of high-temerature creep-fatigue tester.
Described spindle assemblies 50 comprises connecting rod 51 and lower link 52, described upper connecting rod 51 and described lower link 52 coaxial; The lower end of described lower link 52 is provided with axial guidance 53; Be thread connection between described lower chuck assembly and described upper connecting rod 51;
Described loaded line displacement measurement assembly 30 comprises the identical fixation kit A30 of the two groups of structures measurement components B30 identical with two groups of structures.
Described fixation kit A30 comprise snap ring A31, lower snap ring A35, two voussoir A32, on extend bar A33 and under to extend bar A34, described upper snap ring A31 is identical with the structure of lower snap ring A35: the angle block of right angle be namely made up of two side plates, and described two side plates are respectively equipped with through hole; Described upper snap ring A31 by the through hole on a side plate with on the bar A33 that extends rivet, described upper snap ring A31 joins merga pass voussoir A32 by the pin 12 in the through hole on another side plate and upper grip assembly and fixes, thus by extend one end of bar A33 and described upper grip assembly fix; Described lower snap ring A35 by the through hole on a side plate with under the bar A34 that extends rivet, described lower snap ring A35 joins merga pass voussoir A32 by the pin 12 in the through hole on another side plate and lower chuck assembly and fixes, thus by under extend one end of bar A34 and described lower chuck assembly fix.
Described measurement components comprise with described on extend bar A33 the bracket B31 that fixes of the other end and with described under to extend the fixing bottom bracket B32 of the other end of bar A34, be provided with two deep groove ball bearing B34 respectively between described bracket B31 and described axial guidance 53 and between described bottom bracket B32 and described axial guidance 53; Described bracket B31 is provided with the first axially extending bore B38, is provided with adjuster bar B33 in described first axially extending bore B38, and described adjuster bar B33 holds out against screw B39 by one and fixes; Described bottom bracket B32 is provided with the second axially extending bore B40 coaxial with the first axially extending bore B38 on bracket B31, and described second axially extending bore B40 is for placing extensometer, and described extensometer holds out against screw B41 by one and fixes; Be provided with a spring(-supported) mount B35 respectively on two bracket B31 in two groups of measurement components and on two bottom bracket B32, between two spring(-supported) mount B35 between two spring(-supported) mount B35 between two bracket B31 and between two bottom bracket B32, be equipped with two tension spring B36.
The measurement components that the identical fixation kit of two groups of structures is identical with two groups of structures is arranged on the both sides of spindle assemblies respectively symmetrically.Be coaxially arranged between described upper grip assembly, described lower chuck assembly, described loaded line displacement measurement assembly.
When sample is installed, first, the chuck 11 of upper grip assembly 10 and testing machine top are linked by pull bar and maintain static, chuck 21 in lower chuck assembly 20 is connected to upper connecting rod 51, lower link 52, axial guidance 53 lower end that tests a machine successively, then compact tensile specimen is fixed between described upper grip assembly and two chucks 11 and 21 of lower chuck assembly by pin 12 and pin 22.Secondly, be embedded on snap ring A31 by voussoir A32, by the bar A33 that extends be fixed on pin 12, the bar A34 that in like manner extends down is fixed on pin 22 in the same way; Again, two identical heavy ditch ball bearing B34 are positioned over bracket B31 and bottom bracket B32 respectively, and contact with axial guidance 53, then two identical spring(-supported) mount B35 are embedded on two bracket B31 and two bottom bracket B32.Finally, two spring(-supported) mount B35 between bracket B31 an a two spring(-supported) mount B35 and two bottom bracket B32 are fixed up by the tension spring B36 respectively identical by the two pairs of structures, then the extensometer that installation test is used in second through hole of bottom bracket B32, and fix with screw B41, by the Level Change extensometer measurement range of adjusting lever B33.Under load effect, compact tensile specimen is out of shape along with load change, and deep groove ball bearing B34 slides on corresponding axial guidance 53.
When carrying out high-temerature creep-fatigue crack propagation test after this device clamping sample, compact tensile specimen is under the effect of test cycle load, loaded line displacement change curve in time in process of the test can be recorded, and then the crack initiation and propagation behavior of research compact tensile specimen, thus the life-span of prediction sample.
Although invention has been described by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (3)
1. a compact tensile specimen creep-fatigue crack expansion test device, comprises spindle assemblies (50), it is characterized in that:
One end of described spindle assemblies (50) is provided with upper grip assembly (10) and lower chuck assembly (20), and the other end of described spindle assemblies (50) is provided with two groups of loaded line displacement measurement assemblies;
Described upper grip assembly is identical with the structure of lower chuck assembly comprises chuck (11) and pin (12) respectively, described chuck (11) is character cut in bas-relief opening fork, the web joint of character cut in bas-relief opening fork is provided with threaded hole, coaxial pin-and-hole is provided with in the both sides of character cut in bas-relief opening fork, described pin (12) is through in the pin-and-hole of character cut in bas-relief opening fork both sides, the two ends of described pin (12) expose to the both sides of character cut in bas-relief opening fork respectively, and the two ends of described pin (12) are respectively equipped with draw-in groove (13); Be thread connection between described upper grip assembly and the high temperature pull bar of high-temerature creep-fatigue tester;
Described spindle assemblies (50) comprises connecting rod (51) and lower link (52), and described upper connecting rod (51) and described lower link (52) are coaxially; The lower end of described lower link (52) is provided with axial guidance (53); Be thread connection between described lower chuck assembly and described upper connecting rod (51);
Described loaded line displacement measurement assembly comprises the identical fixation kit of the two groups of structures measurement components identical with two groups of structures; Described fixation kit comprise snap ring (A31), lower snap ring (A35), two voussoirs (A32), on extend bar (A33) and under to extend bar (A34), described upper snap ring (A31) is identical with the structure of lower snap ring (A35): the angle block of right angle be namely made up of two side plates, and described two side plates are respectively equipped with through hole; Described upper snap ring (A31) by the through hole on a side plate with on bar (A33) of extending rivet, described upper snap ring (A31) joins merga pass voussoir (A32) fixing by the pin (12) in the through hole on another side plate and upper grip assembly, thus by extend one end of bar (A33) and described upper grip assembly fix; Described lower snap ring (A35) by the through hole on a side plate with under bar (A34) of extending rivet, described lower snap ring (A35) joins merga pass voussoir (A32) fixing by the pin (12) in the through hole on another side plate and lower chuck assembly, thus by under extend one end of bar (A34) and described lower chuck assembly fix;
Described measurement components comprise with described on extend the fixing bracket (B31) of the other end of bar (A33) and with described under to extend the fixing bottom bracket (B32) of the other end of bar (A34), be provided with two deep groove ball bearings (B34) between described bracket (B31) and described axial guidance (53) and between described bottom bracket (B32) and described axial guidance (53) respectively; Described bracket (B31) is provided with the first axially extending bore (B38), be provided with adjuster bar (B33) in described first axially extending bore (B38), described adjuster bar (B33) holds out against screw (B39) by one and fixes; Described bottom bracket (B32) is provided with second axially extending bore (B40) coaxial with the first axially extending bore (B38) in bracket (B31), described second axially extending bore (B40) is for placing extensometer, and described extensometer holds out against screw (B41) by one and fixes;
Two bracket (B31) in two groups of measurement components above and on two bottom brackets (B32) are provided with a spring(-supported) mount (B35) respectively, are equipped with two tension springs (B36) between two spring(-supported) mounts (B35) between two spring(-supported) mounts (B35) between two bracket (B31) and between two bottom brackets (B32);
The measurement components that the identical fixation kit of two groups of structures is identical with two groups of structures is arranged on the both sides of spindle assemblies respectively symmetrically.
2. a kind of compact tensile specimen creep-fatigue crack expansion test device according to claim 1, it is characterized in that: fixedly adopting between bar of extending on described (A33) and described bracket (B31) is screwed, fixedly adopting between bar of extending under described (A34) and described bottom bracket (B32) is screwed.
3. a kind of compact tensile specimen creep-fatigue crack expansion test device according to claim 1, is characterized in that: for coaxially arranged between described upper grip assembly, described lower chuck assembly, described loaded line displacement measurement assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801652.XA CN105277445A (en) | 2015-11-19 | 2015-11-19 | Compact tensile sample creep-fatigue crack propagation testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510801652.XA CN105277445A (en) | 2015-11-19 | 2015-11-19 | Compact tensile sample creep-fatigue crack propagation testing device |
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| CN105277445A true CN105277445A (en) | 2016-01-27 |
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| CN201510801652.XA Pending CN105277445A (en) | 2015-11-19 | 2015-11-19 | Compact tensile sample creep-fatigue crack propagation testing device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442113A (en) * | 2016-12-01 | 2017-02-22 | 天津大学 | Efficient testing device for acquiring complete creep curve and microscopic structure and testing method of testing device |
| CN106644700A (en) * | 2016-11-18 | 2017-05-10 | 西北工业大学 | Small sample fixture for creepage of plate high-temperature alloy |
| CN107044937A (en) * | 2017-04-13 | 2017-08-15 | 天津大学 | A kind of tension-torsion extensometer of ball bearing linkage |
| CN108195663A (en) * | 2017-12-21 | 2018-06-22 | 中国航发北京航空材料研究院 | A kind of high-temerature creep extensometer based on ceramic material |
| CN108931440A (en) * | 2017-05-27 | 2018-12-04 | 核工业西南物理研究院 | A kind of small sample is uniaxially stretched creep test fixture |
| CN109520857A (en) * | 2018-12-07 | 2019-03-26 | 华东理工大学 | High-throughput small sample creep and On Creep Crack Growth experimental rig and its application method |
| CN109870371A (en) * | 2019-03-28 | 2019-06-11 | 中南大学 | A kind of creep compression test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108931440A (en) * | 2017-05-27 | 2018-12-04 | 核工业西南物理研究院 | A kind of small sample is uniaxially stretched creep test fixture |
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| CN109870371A (en) * | 2019-03-28 | 2019-06-11 | 中南大学 | A kind of creep compression test device |
| CN109870371B (en) * | 2019-03-28 | 2023-08-29 | 中南大学 | Creep compression experimental device |
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